What is the minimum extension for ladders from the top of an excavation?

The correct answer is founded on safety regulations that require ladders to extend a specific distance above the edge of an excavation to provide a secure means of access for workers. Extending the ladder by a minimum of 3 feet ensures that workers have enough handhold when ascending or descending, which reduces the risk of falls or accidents.

This standard is essential for maintaining safety protocols in construction and excavation sites. A 3-foot extension allows sufficient height for workers to grip the ladder securely, promoting stability. Moreover, this extension makes it easier to enter and exit the excavation safely, especially in situations where the edge might be unstable or poorly maintained.

The other options suggest shorter extensions that do not meet the safety requirements necessary for excavations, potentially compromising the safety of workers in hazardous environments. By adhering to the 3-foot extension guideline, workers can ensure they have safe access to excavations, aligning with best practices in occupational safety.